2 days ago i have been to an a/c tehnician and his opinion is that the compressor internal discharge valve is nit closing and the pressure on Hi side is making that noise. In fact he said that after a/c pump stops the pressure on Hi and Low side must equalise through the expansion valve not through ...

Hi How did you solved this noise on the compressor in the end? I have exactly same noise on my Mazda 3 . I changed the expansion valve ,receiver drier , cabin filters , flushed all the pipes , changed the Pag oil and changed all the o-rings. After recharging with r134 same horrible sound. Clutch com...